[1] Univ Alabama Birmingham, Sch Med, Dept Med, Birmingham, AL 35294 USA
[2] Pontificia Univ Catolica Chile, Sch Med, Dept Clin Immunol & Rheumatol, Santiago, Chile
[3] Univ Alabama Birmingham, Sch Med, Dept Surg, Birmingham, AL 35294 USA
[4] Univ Alabama Birmingham, Sch Publ Hlth, Dept Epidemiol, Birmingham, AL 35294 USA
[5] Univ Texas Hlth Sci Ctr Houston, Dept Med, Houston, TX USA
[6] Univ Puerto Rico, Dept Med, San Juan, Puerto Rico, Spain